I think you need to focus on the fact that you are helping them, that they are not alone, not just the full-figured part. Most people who consult a trainer feel self-conscious regardless of their size.

How about:

Renewed Life or
Renewed You

Then you could play off the "re" part in your other marketing/advertising materials:

Relax. I will help you.
Revive. The old you who is hiding deep inside.
Reshape. Yourself, your health, your future.

Your business cards can refer to this as well:
Patti XXXX,
Renewal Partner